• Title/Summary/Keyword: water flow measurement

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A Study of the Precise Flow Measurement using Coriolis flowmeter (코리올리 유량계를 이용한 정밀유량측정에 관한 연구)

  • Kim, In-Tae;Cho, Dae-Kee;Jeong, Min-Je;Lee, Jae-Won;Seo, Hyuk;Yu, Myoung-Jong
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.05a
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    • pp.61-64
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    • 2008
  • For the performance evaluation of liquid mono-propellant thruster, Vacuum Hot-fire test is necessarily required. An accurate flow measurement is one of the key parameters to the successful T&E program. This paper describes the characteristics of the coriolis flowmeter, explains the cold-flow test using simulant propellant (DIW), and presents the test results. Finally, the cold test results have been verified in comparison with the hot-fire test data.

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Prediction of Chlorine Concentration in a Pilot-Scaled Plant Distribution System (Pilot 규모의 모의 관망에서의 염소 농도 예측)

  • Kim, Hyun Jun;Kim, Sang Hyun
    • Journal of Korean Society of Water and Wastewater
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    • v.26 no.6
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    • pp.861-869
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    • 2012
  • The chlorine's residual concentration prevents the regrowth of microorganism in water transport along the pipeline system. Precise prediction of chlorine concentration is important in determining disinfectant injection for the water distribution system. In this study, a pilot scale water distribution system was designed and fabricated to measure the temporal variation of chlorine concentration for three flow conditions (V = 0.88, 1.33, 1.95 m/s). Various kinetic models were applied to identify the relationship between hydraulic condition and chlorine decay. Genetic Algorithm (GA) was integrated into five kinetic models and time series of chlorine were used to calibrate parameters. Model fitness was compared by Root Mean Square Error (RMSE) between measurement and prediction. Limited first order model and Parallel first order showed good fitness for prediction of chlorine concentration.

An Experimental Investigation of the Interfacial Condensation Heat Transfer in Steam/water Countercurrent Stratified Flow in a Horizontal Pipe

  • Chu, In-Cheol;Yu, Seon-Oh;Chun, Moon-Hyun;Kim, Byong-Sup;Kim, Yang-Seok;Kim, In-Hwan;Lee, Sang-Won
    • Proceedings of the Korean Nuclear Society Conference
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    • 1998.05a
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    • pp.565-570
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    • 1998
  • An interfacial condensation heat transfer phenomenon in a steam/water countercurrent stratified flow in a nearly horizontal pipe has been experimentally investigated. The present study has been focused on the measurement of the temperature and velocity distributions within the water layer. In particular, the water layer thickness used in the present work is large enough so that the turbulent mixing is limited and the thermal stratification is established. As a result, the thermal resistance of the water layer to the condensation heat transfer is increased significantly. An empirical correlation of the interfacial condensation heat transfer has been developed. The present correlation agrees with the data within $\pm$15%

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A Study on Flow Characteristics with Ultrasonic Forcing in a Coaxial Circular Pipe by PIV Measurement (동심원관내에서 초음파가 가진된 유동특성의 PIV계측에 의한 연구)

  • Koo, J.H.;Park, Y.H.;Choi, W.C.;Song, M.G.;Ju, E.S.
    • Proceedings of the KSME Conference
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    • 2000.11b
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    • pp.639-644
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    • 2000
  • An experiment on the enhancement of turbulent flow with ultrasonic forcing was carried out by using PIV measurement in a coaxial circular pipe which could offer characteristics of the turbulence flow plentifully through its jet. A large transparent acryl tank and a coaxial circular pipe nozzle were made for the above research. city water of $25^{\circ}C$ was selected as an experimental liquid and the front flow field of the coaxial circular pipe was divided vertically as 3 measuring regions to observe characteristics of flow phenomena. characteristics of fluid flow such as velocity vector distribution, kinetic energy, turbulent intensity and etc. were visualized, observed, examined and considered at 5 kinds of Re No. such as $Re=1{\times}10^3,\;2{\times}10^3,\;3{\times}10^3,\;5{\times}10^3,\;1{\times}10^4$. In result it was proved that ultrasonic vibration affected the enhancement of turbulent flow.

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Turbulent Flow Measurements by Laser Velocimeter in Circulating Water Channel (레이져 유속계를 이용한 회류수조의 난류유동 측정)

  • Eun-Soo,Choi;Hyung-Jin,Sung;Jang-Hyuk,Kwon
    • Bulletin of the Society of Naval Architects of Korea
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    • v.26 no.3
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    • pp.1-8
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    • 1989
  • The flow characteristics of a circulating water channel which is appropriate for a flow measurement and visualization in the laboratory has been investigated by using a Laser Doppler Anemometer. In order to get a stable and uniform distribution of mean velocity at the test section, the surface flow accelerator is designed and used. The experimental results that the turbulent structure should be considered with the mean velocity for obtaining the reasonable uniformity at the test section.

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Accuracy Analysis of Ultrasonic, Magnetic and Radar Sensors for Manhole Monitoring

  • Khatatbeh, Arwa;Kim, Young-Oh;Kim, Hyeonju
    • Proceedings of the Korea Water Resources Association Conference
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    • 2021.06a
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    • pp.427-427
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    • 2021
  • During the rainy season, heavy downpours are always a source of concern for the world. Flooding and heavy rains can devastate communities, disrupt agriculture, and contribute to traffic accidents.. Weir and flow hall effect sensors are the conventional analytical methods for measuring flow rate; in this paper, we analyzed manhole flowrate statistics. The measurement of the flow rate of a notch/weir is a time-consuming task that necessitates continuous mathematical analysis. . We created three types of IoT sensors in this study: (HC-SR04 ultrasonic, YF-S201 magnetic, and HB100 radar), which take the sensor's real-time input signal and estimate the flow using a notch equation and a previously calibrated optimized coefficient of discharge. The proposed systems are cost-effective, but in terms of accuracy, we found that the HC-SR04 ultrasonic sensor is the best of the three systems

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Fall Velocity Measurement in the Turbulent Flow Using Image Analysis Method (영상해석 기법을 이용한 난류 흐름 중 침강속도의 측정)

  • Yun, Sang-Hun;Yu, Gwon-Gyu;Yun, Byeong-Man
    • Journal of Korea Water Resources Association
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    • v.34 no.6
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    • pp.745-751
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    • 2001
  • Fall velocities of sand particles in the turbulent flow are analyzed through measurements using PTV. PTV is believed to be the only instrument to measure the fall velocity in the turbulent flow, since it can trace the individual particle. The method is verified by comparison with existing formula for still-water case. The experimental results show that the fall velocity in the turbulent flow decreases compared with that in still water, and decreases by 40% as the turbulent intensity normalized by the friction velocity increases upto 1.

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MEASUREMENT OF THE SINGLE AND TWO PHASE FLOW USING A NEWLY DEVELOPED AVERAGE BIDIRECTIONAL FLOW TUBE

  • Yun, Byong-Jo;Euh, Dong-Jin;Kang, Kyunc-Ho;Song, Chul-Hwa;Baek, Won-Pil
    • Nuclear Engineering and Technology
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    • v.37 no.6
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    • pp.595-604
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    • 2005
  • A new instrument, an average BDFT (Birectional Flow Tube), was proposed to measure the flow rate in single and two phase flows. Its working principle is similar to that of the Pilot tube, wherein the dynamic pressure is measured. In an average BDFT, the pressure measured at the front of the flow tube is equal to the total pressure, while that measured at the rear tube is slightly less than the static pressure of the flow field due to the suction effect downstream. The proposed instrument was tested in air/water vertical and horizontal test sections with an inner diameter of 0.08m. The tests were performed primarily in single phase water and air flow conditions to obtain the amplification factor(k) of the flow tube in the vertical and horizontal test sections. Tests were also performed in air/water vertical two phase flow conditions in which the flow regimes were bubbly, slug, and churn turbulent flows. In order to calculate the phasic mass flow rates from the measured differential pressure, the Chexal drift-flux correlation and a momentum exchange factor between the two phases were introduced. The test results show that the proposed instrument with a combination of the measured void fraction, Chexal drift-flux correlation, and Bosio & Malnes' momentum exchange model could predict the phasic mass flow rates within a $15\%$ error. A new momentum exchange model was also proposed from the present data and its implementation provides a $5\%$ improvement to the measured mass flow rate when compared to that with the Bosio & Malnes' model.

Analysis of Water Quality Trends Using the LOADEST Model: Focusing on the Youngsan River Basin (LOADEST 모형을 활용한 수질 경향성 분석: 영산강 수계를 중심으로)

  • Gi-Soon, Lee;Jonghun, Baek;Ji Yeon, Choi;Youngjea, Lee;Dong Seok, Shin;Don-Woo, Ha
    • Journal of Korean Society on Water Environment
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    • v.38 no.6
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    • pp.306-315
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    • 2022
  • In this study, long-term measurement data were applied to the LOADEST model and used as an analysis tool to identify and interpret trends in pollution load. The LOADEST model is a regression equation-based pollution load estimation program developed by the United States Geological Survey (USGS) to estimate the change in the pollution load of rivers according to flow rate and time and provides 11 regression equations for pollution load evaluation. As a result of simulating the Gwangjuchen2, Pungyeongjeongchen, and Pyeongdongchen in the Yeongbon B unit basin in the middle and upper reaches of the Yeongsan River with the LOADEST model using water quality and flow measurement data, lower values were observed for the Gwangjuchen2 and Pyeongdongchen, whereas the Pungyeongjeongchen had higher values. This was judged to be due to the characteristics of the LOADEST model related to data continuity. According to the parameters estimated by the LOADEST model, pollutant trends were affected by increases in the flow. In addition, variability increased with time, and BOD and T-P were affected by the season. Thus, the LOADEST model can contribute to water quality management as an analytical tool for long-term data monitoring.

Development of an Average Bi-directional Flow Tube for the Measurement of Single and Two phase Flow Rate (단상 및 이상유동 유량 계측을 위한 평균 양방향 유동 튜브 개발)

  • Yun, Byong-Jo;Kang, Kyong-Ho;Euh, Dong-Jin;Baek, Won-Pil
    • 유체기계공업학회:학술대회논문집
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    • 2004.12a
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    • pp.172-179
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    • 2004
  • Average Bi-directional flow tube was suggested to measure single and two phase flow rate. Its working principle is similar with Pilot tube, however, it makes it possible to eliminate the cooling system which is normally needed to prevent from flashing in the pressure impulse line of Pilot tube when it is used in the depressurization condition. The suggested instrumentation was tested in the air-water vertical test section which has 80mm inner diameter and 10m length. The flow tube was installed at 120 of L/D from inlet of test section. From the test, single air and water flow rate was measured successfully. For the emasurement of two phase flow rate, Chexal drift-flux correlation was used. In the test a new correlation of momentum exchange factor was suggested. The test result shows that the suggested instrumentation using the measured void fraction and Chexal drift-flux correlation can predict the mass flow rates within $10\%$ error of measured data.

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